FactCheck.org has a tally of how both McCain and Obama have misled voters.
"Normally we post a 'Whoppers' compilation the week before Election Day. This time we've already seen such a large number of twisted facts, misleading claims and outright falsehoods that we are doing that now.
It's not just Sarah Palin's claim about killing the bridge project that she had supported until it became a national laughingstock and Congress turned against it. That's just the whopper that got the attention of many news orgaizations earlier this month. There have been lots of others.
McCain has made multiple false representations of Obama's tax proposals. Obama has made false claims about McCain's stance on Social Security. Both McCain and Obama have traded some whoppers about their energy policies, about Iraq, and about Iran, and about supporting troops."
See the list here.