“With all due respect, I’ve won twice as many states as Senator Clinton. I’ve won more of the popular vote than Senator Clinton. I have more delegates than Senator Clinton.” Barack Obama
Republicans would never be so spineless as to suggest someone winning a campaign combine forces like the dual-ticket debate that's going on now. Obama is winning. There are winners and there are losers. Clinton is losing. She is currently the loser. Didn't these guys play little league as kids? Geez.
As for a "dream ticket," that's a joke. Hillary Clinton is divisive and disliked. Independents would be more likely to vote for McCain than a Hillary-Obama ticket. Obama, however, is a more attractive opponent against McCain.