[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/POLITICS/11/02/campaign.wrap/t1hom.mccain.pa.sun.01.ap.jpg caption="Americans are split about the one party rule, poll says."]
(CNN) - It's one of John McCain's closing arguments in his bid for the White House. The Republican Presidential nominee suggests that Democrats will increase their majorities in Congress, and he warns of one party rule by the Democrats if Barack Obama is elected president.
McCain has said that Obama is "working out the details" with Democratic leader to raise taxes, increase spending and "concede defeat in Iraq."
But a new national poll suggests that Americans may not be as concerned about one party if Obama wins the White House. In a CNN/Opinion Research Corporation survey released Sunday, 50 percent of likely voters questioned say that if Obama wins the White House, Congress should be controlled by Democrats, with 48 percent saying Republicans should control both the House and the Senate.
It appears to be a different story if McCain wins the presidential election. Fifty-nine percent of those polled say the Democrats should control Congress if McCain wins the White House, with 39 percent saying the Republicans should be in charge of Capitol Hill.
The Democrats currently have a 235 to 199 majority in the House of Representatives and a 51 to 49 advantage in the Senate, with the chamber's two independent senators allied with the Democrats.
One of Barack Obama's closing points is that John McCain would carry out George Bush's policies if elected, saying, the Arizona senator has "ridden shotgun" with the president over the economy.
The poll suggests that 53 percent think McCain will mostly carry out Bush's policies, with 45 percent saying he won't. As for Bush, only 28 percent approve of the way he's handling his job as president.
Likely voters questioned in the poll were also asked whether Senator Obama (D-Illinois) will win the election.
"Nine in ten think it's likely; nearly half say it is very likely. Only one in ten say it is very likely that McCain will win, while half say a McCain victory is unlikely," said CNN Polling Director Keating Holland.
How will Obama supporters react if he does not win on Tuesday? One in five will be angry; one in four will be upset but not angry. Most Obama supporters, however, say they will be disappointed but not angry or upset if McCain wins.
The poll also suggests the Democrats are much more excited about this election than Republicans.
Forty-five percent of Democrats questioned say they are extremely enthusiastic about voting this year, with only 28 percent of Republicans feeling the same way.
The economy remains the most important issue for voters.
"The economy remains the number-one issue to most voters, but although eight in 10 say that economic conditions are poor now, 62 percent say that the economy will be in good shape a year from now," Holland said. "The economy, which is already a strong issue, jumped even further in importance after the financial crisis hit in September."
"And since the public tends to blame the Republicans more than the Democrats for that crisis, that event provided a boost not just to Barack Obama but to Democratic candidates across the country. Democratic congressional candidates have a nine-point lead in the 'generic ballot' question," added
The generic ballot asks voters their preference for U.S. House without naming the candidates running in each district.
The CNN/Opinion Research Corporation poll was conducted Thursday through Saturday, with 1,017 adult Americans questioned by telephone. The survey's sampling error ranges from plus or minus 3 percentage points to plus or minus 4.5 percentage points, depending on the question.