Washington (CNN) - A Democratic group joined in Saturday on the attacks against Mitt Romney, arguing that he's a true anti-abortion-rights supporter and was only "faking it" when he took opposing positions as a political candidate in Massachusetts.
"If Romney wins the presidency, he won’t have to ‘fake it’ ever again," said Bill Burton, senior strategist at Priorities USA, a super political action committee dedicated to helping President Barack Obama win re-election.
The comments came in a memo to supporters on Saturday, as the former Massachusetts governor has been taking heat for weeks for wavering on some of his positions, including abortion, during his political career.
But Burton argued that Romney never truly meant it when he previously said he supported a woman's right to choose and only said so in order to win votes in the largely Democratic state of Massachusetts.
"Put simply, the people who knew Romney best knew he was lying," Burton said.
The group falsely said Romney had endorsed a controversial proposal in Mississippi that would define life at conception and ban abortions in cases of rape, incest or when the mother's life is at risk.
While Romney hasn't made an official comment on the so-called "personhood" proposal, which was voted down in the state by a wide margin this week, he said in an interview last month that he would have supported a similar amendment in Massachusetts.
Mike Huckabee, the former Arkansas governor and a 2008 GOP presidential candidate, asked Romney on his Fox News show if he would have supported a "constitutional amendment that would have established the definition of life at conception."
Romney replied: "Absolutely."
The exchange was featured in a web video released by the Democratic National Committee last week, targeting Romney as an extremist on abortion rights.
In his bid for president, Romney has taken the line that “life begins at conception," but he has said any legal measures should be decided by the states, not the federal government.
In response to the Priorities USA memo on Saturday, Romney's team said Democrats are simply fearful of the candidate taking the nomination and proving a tough competitor for Obama.
"The very last thing the Democrats want to do is run against Mitt Romney. That is why they are focused on Mitt Romney and not the economy," said Andrea Saul, a Romney spokeswoman, in a statement. "The Democrats are continuing their campaign of deception in their strategy to ‘kill Romney.’ President Obama’s campaign is going to be very interesting to watch, but it’s not going to work.”