Barack Obama's campaign train was in Wisconsin Friday. The primary is Tuesday and Obama is slightly ahead in the latest polls.

He picked up the endorsement of the Service Employees Union Friday. Congressman John Lewis, a longtime Clinton backer, also says he's considering changing his super-delegate vote to Obama.

Super-delegate Congressman David Scott says he'll definitely switch.

What can Hillary Clinton do to come back?

"I think she has to launch attacks on Obama. Obama is really getting a free ride in the media," said Republican strategist Jack Burkman.

Ron Christie, another Republican strategist, disagrees.

"She needs to show a side of humanity that we haven't seen thus far from her," he said.

Clinton seems to be using a combination of both tactics.

Meanwhile, Obama is warning that he'll fight any Clinton move to count the delegates she won in Michigan and Florida where the Democratic party invalidated the primaries.

Republican frontrunner John McCain is getting a big endorsement as well.

George H.W. Bush, father of the current President, is expected to announce that he's backing McCain on Monday

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