Democrats have a fresh class of Hispanic candidates, he added.
They estimate he spent $400,000 on the television campaign - about double what all the Hispanic candidates together have raised.
But several black and Hispanic candidates have dropped out of the competition for one reason or another.
No black or Hispanic candidate was nominated from a mostly white district.
Several of the contests are between black and Hispanic candidates.
Would you be willing to vote for a Hispanic presidential candidate in 2008?
But he said the major problem was simply getting more black and Hispanic candidates to apply.
One of them, the 13th, was drawn to favor a Hispanic candidate.
In addition, the three declared Hispanic candidates are likely to split the vote.
"But we can still make a difference by supporting Hispanic candidates."