WASHINGTON, March 1 (UPI) -- The presidential campaign team for U.S. Sen. Hillary Clinton, D-N.Y., is finding time to hit less-populated regions ahead of the March 4 primaries.

While Clinton's campaign efforts have primarily focused on larger cities to date, campaign team workers have expanded their efforts to include smaller cities and more rural sites, The Washington Times said Saturday.

Clinton spokesman Howard Wolfson has also taken a very aggressive stance regarding Tuesday's primaries in Texas, Ohio, Vermont and Rhode Island. The Clinton team official said that if Sen. Barack Obama, D-Ill., does not sweep those primaries, it could doom his White House bid.

"If he is unable to win all four states, (it) shows buyers' remorse and there is an interest in having this campaign go on, and it will go on at least until Pennsylvania and beyond," Wolfson said.

The Times said Obama is leading Clinton among delegates 1,383 to 1,276 and has won 11 consecutive primaries. To win the Democratic presidential nomination, a candidate must earn 2,025 delegates.