McCain clinches GOP nomination
(CNN) -- Sen. John McCain swept all four nominating contests on Tuesday to become the Republican presidential nominee.
McCain won primaries in Texas, Ohio, Vermont and Rhode Island, giving him more than the 1,191 delegates needed to clinch the GOP nomination.
On the Democratic side, Sen. Hillary Clinton was projected to break Barack Obama's 12-contest winning streak with a victory in Rhode Island.
Obama was projected to take Vermont, but the contests in Ohio and Texas were too close to call.
Mike Huckabee dropped out of the Republican race after the results came in.
McCain is slated to go to the White House on Wednesday to receive the endorsement of President Bush, according to two Republican sources.
The Arizona senator's campaign -- his second run for the White House -- was largely written off for dead last summer amid outspoken opposition from the party's conservative base, a major staff shakeup and disappointing fundraising.
But McCain said earlier Tuesday that he was confident he would emerge as the presumptive nominee by the end of the night.
McCain overwhelmingly won moderates and conservatives in Ohio, but he lost the evangelical vote to Mike Huckabee, according to exit polls.
MoreI am a little underwhelmed, but we know who our standard bearer will be in november.