[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/07/30/art.billc.gi.jpg caption="Did Bill Clinton take a dig at Obama?."]
(CNN) - A senior advisor to Barack Obama said again Tuesday Bill Clinton would definitely stump for the Illinois senator in crucial swing states, as the former president again grabbed headlines with comments that seemed to suggest he was less-than-supportive of the presumptive Democratic nominee.
"Suppose you're a voter, and you've got candidate X and candidate Y,” Bill Clinton said Tuesday at a Democratic event in Denver that featured his first public remarks since his wife Hillary Clinton was officially informed she would not be vice president.
“Candidate X agrees with you on everything, but you don't think that candidate can deliver on anything at all. Candidate Y you agree with on about half the issues, but he can deliver. Which candidate are you going to vote for?" he asked – adding, after a pause: "This has nothing to do with what's going on now."
Sources told CNN this week that the former president was unhappy with his assigned speech topic for the convention, national security.
At a Tuesday briefing with senior officials from both the Clinton and Obama campaigns, a senior aide for the Illinois senator’s White House bid said that Bill Clinton would hit the trail for his wife’s primary season rival, and “is going to be very helpful in these battleground states.”
Bill Clinton will be on hand Tuesday evening as his wife Hillary addresses Democratic delegates on the second night of the party’s nominating convention.