With his plans for universal health coverage and "big ideas," Bill Bradley appealed most to unreformed liberals. But Gore focused his efforts on attacking Bradley's proposals as too risky, and as portraying himself as the safe Democratic alternative for centrist voters.

McCain, on the other hand, had tremendous moderate and Democratic appeal. And while McCain's cross-party drawing power served him well in early primaries, Bush was able to wait out the McCain tide by appealing to party-line Republicans and the religious right.

But Bush's pandering to the Republican right is undoubtedly giving Gore fodder for the general election, and Bush's amazing cash reserves have been drawn down during his primary battles. And Gore has remained in the center while Bush is tilting rightward.

Life After Death?

John McCain may have failed to win the Republican nomination, but his widespread popularity means that he will still have an impact on the general election.

McCain may decide to cash in on his popularity with moderates and join the Reform Party.

"[McCain's] staff is interested in going to a third party," White said.

If he does declare, McCain has enough support to be eligible to participate in all presidential debates, White said.