[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/POLITICS/07/20/dobson.mccain.ap/art.dobson.mccain.gi.jpg caption="While conservative Christian leader James Dobson hasn't officially endorsed McCain, he says he doesn't rule it out."]
(CNN) - Focus on the Family Founder James Dobson said Monday he may endorse John McCain's White House bid - a major reversal for the evangelical leader who has been a longtime foe of the Arizona senator.
In a pretaped Focus on the Family radio broadcast, Dobson officially softened his stance toward McCain, saying, "I never thought I would hear myself saying this while I am not endorsing Sen. John McCain, the possibility is there that I might."
Watch: Religion and campaign '08
Dobson, who once said he could never bring himself to endorse McCain, also says during the broadcast that while he continues to disagree with the Republican presidential candidate on a host of issues, generally he is closer to McCain than he is to presumptive Democratic presidential nominee Sen. Barack Obama.
"The fact (is) that I'm so very concerned about Sen. Obama and what he believes and stands for, as well as the need to rethink some of my views regarding Sen. McCain. And that thinking has taken place and continues to do so," Dobson also said on the radio program.
Watch: Analysis: Dobson on Obama
"This has been the most difficult moral dilemma for me. It's why you haven't heard me say much about it because I have struggled on this issue and there's some concerns here that matter to me more than my own life. And neither of the candidates is consistent with my views in that regard."
Dobson, one of the most powerful figures in the evangelical community, has been a longtime critic of McCain, especially after it became clear the Arizona senator would win his party's presidential nomination. In addition to declaring he would not endorse or vote for McCain, Dobson said last April the Republican presidential candidate was fracturing the Republican Party and was
"intent on driving away" conservatives.
But Dobson, never one to shy away from the spotlight, has also been extremely critical of Obama, asserting last month the Illinois senator distorted biblical passages to make political points.
Criticizing a speech Obama gave in June 2006 to the to the liberal Christian group Renewal - during which Obama said it would be impractical to govern based solely on the word of the Bible, noting some passages suggest slavery is permissible and eating shellfish is disgraceful - Dobson said the Illinois senator was misrepresenting the Bible and taking a "fruitcake interpretation" of the Constitution.
Obama responded sharply, telling reporters Dobson was "making stuff up" about him.
"Someone would be pretty hard pressed to make that argument," Obama said then. "It is a speech that affirms the role of faith not just in my life but in the life of the American people, that suggests that we make a mistake by trying to push faith out of the public square."
Speaking on his radio program Monday, Dobson said he's realized the election has come down to a decision between two "imperfect candidates."
"I have considered the fact that the elections always involved imperfect candidates, there are no perfect human beings and you always have to chose between two flawed individuals, that's the way we're all made," he said.
It remains unclear just how influential a formal endorsement from Dobson would be for McCain, who has long battled ambivalent, and at times downright hostile, feelings from many social conservatives. But Dobson's sharp departure from his once-stated vow of never voting for McCain is clearly welcome news in the Republican presidential hopeful's campaign.
A senior McCain aide told CNN the Arizona senator and Dobson have never spoken, and the McCain campaign has not reached out to the evangelical leader. But a McCain spokesman said he is "encouraged."
"Our campaign is working diligently to build even greater support for Senator McCain's message of reform, prosperity and peace, so we are encouraged by signals of additional supporters and new venues for our conversation with voters," said McCain spokesman Tucker Bounds.
Dobson's comments also come amid an increased effort among the Obama campaign to appeal to a new generation of Christian evangelicals that some are calling the "Christian Left."
As part of his outreach to evangelical voters, the presumptive Democratic presidential nominee visited an Ohio Ministry earlier this month and gave an address on how he plans to build a "real" partnership between faith-based organizations and the White House if he becomes president.
Obama's outreach to evangelical voters has also included private summits with pastors, an effort to reach out to young evangelicals and a fund-raiser with the Matthew 25 political action committee. It describes itself as a group of moderate evangelicals, Catholics and Protestants committed to electing the Illinois Democrat president.
In a CNN poll conducted by Opinion Research Corporation on June 4-5, nearly two-thirds of white evangelical voters surveyed, 64 percent, supported McCain, and 30 percent backed Obama. The poll's margin of error was plus or minus 6.5 percentage points.
In comparison, Bush received the support of 78 percent of evangelical voters in the 2004 election, according to exit polls.
(Updates with fuller quotes from Dobson)