People to watch in the healthcare debate's next phase

With the Senate Finance Committee passing a healthcare bill, action shifts to the full Senate, where Majority Leader Harry Reid and the White House must craft a bill that can win 60 votes to avoid a filibuster. Reid's challenge is to hold together Democrats and independents of varying ideological hues while possibly attracting a few Republicans. Here, the Wall Street Journal lists six key figures to watch in coming weeks as the healthcare debate enters its next phase.