Some not-so-good news for Barack Obama and his media supporters, who are busy celebrating The Chosen One's 100 days in office.

From Rasmussen Reports:

For the first time since Barack Obama was elected president last November, more than half of US voters (53%) say it is at least somewhat likely that the next occupant of the White House will be a Republican.

Thirty-one percent (31%) say it is Very Likely. Thirty-five percent (35%) say it is not very or not at all likely, according to a new Rasmussen Reports national telephone survey. Twelve percent (12%) arent sure.

This is not an expectation related to the 2012 election. It is a question about the President following Obama which could happen in either 2012 or 2016.

Naturally, there is a partisan divide -- 77% of Republican voters say it's likely the next president will be from their party. Just 39% of Democrats agree. Still, that's an increase among both parties from previous surveys. Among voters not affiliated with either major party, 47% now say a GOP president is likely, while 33% think not.

Just after Obama's election, 50% of voters said the next president is likely to be a Republican ... Forty-six percent (46%) of voters now say President Obama is governing like a partisan Democrat, down four points from last month.

But the new finding is still higher than those in surveys during Obama's first few weeks as president. Thirty-five percent (35%) believe the president is governing on a bipartisan basis, and 18% are undecided.

Read more poll results at the Rasmussen Reports Web site.

And more good news for the GOP. Rasmussen Reports says that "for just the second time in more than five years of daily or weekly tracking, Republicans now lead Democrats in the latest edition of the Generic Congressional Ballot for the 2010 elections."

Read those poll results here.