From CBS News March 4

Barack Obama sought a knockout against rival Hillary Rodham Clinton as voting began Tuesday in crucial contests in Texas and Ohio, where the former first lady desperately needs a win to salvage her once-powerful candidacy for the Democratic presidential nomination. Full Article.

By Steven Rosenfeld on AlterNet March 4

Turnout in Ohio's 2008 primary today is almost certain to set a record and could approach what is normally seen in a fall general election. Full Article.