Gallup's latest has Clinton by five points nationally. Money quote:
Hillary Clinton and Barack Obama remain fairly closely matched in national Democratic voters' nomination preferences, although Clinton appears to have stopped Obama's momentum over the past two days ... Clinton has led Obama in Gallup's daily interviewing conducted Sunday and Monday. This suggests that her position may be stronger in Super Tuesday voting than some have anticipated given Obama's rapid closing of the 20-percentage point gap with Clinton that existed two weeks ago. Still, fluidity in the Democratic race in recent days has increased (with support for Obama higher on some individual days than others, and occasionally surpassing support for Clinton), suggesting shifting vote preferences as the media buildup to Super Tuesday has intensified (and as campaign advertising and news has barraged Democratic voters in many Super Tuesday states).