Mitt Romney won Republican presidential primaries in five states on Tuesday, adding to a delegate total that already exceeds the number needed to win the nomination.
Romney won primaries in California, New Jersey, South Dakota, New Mexico and Montana.
Romney has 1,398 delegates. He needs 1,144 to win the Republican nomination at the party's national convention in August.
A total of 264 delegates were at stake in Tuesday's contests - including 169 in California - and Romney has a chance to win them all.
With the primary season winding down, Romney is already in general election mode. He will take on Democrat Barack Obama in the fall.
After Tuesday, only one Republican presidential primary remains, in Utah on June 26.
Romney has recently been concentrating on raising campaign funds. His two-day swing to Texas is expected to garner $15 million for his presidential campaign.
Romney supporter Ray Washburne told the crowd at a Dallas fundraiser Tuesday that the presumptive Republican nominee would raise that much at a slew of meetings. Some $3.5 million was expected be raised from almost 500 people at the Belo Mansion in downtown Dallas.
Tickets start at $2,500 for a reception, $10,000 for a photograph with the governor, and $50,000 for dinner. Romney has fundraisers scheduled Wednesday in San Antonio and Houston.