Hillary Clinton's campaign has accused Barack Obama's camp of engaging in ''outrageous'' and ''undemocratic'' tactics during the voting in Texas, including locking her supporters out of caucuses.

The Obama camp denied the allegations as a ''laughable'' attempt to play down the state's caucuses, a political nominating exercise that has produced better results for their White House candidate in other states.

Clinton's Texas state director Ace Smith said on Tuesday there was a ''really tremendously disturbing pattern'' of vote irregularities in Texas, which conducted a statewide presidential primary followed by caucuses.

The Clinton campaign accused the Obama operation of taking materials supposed to be available for both sides in the caucuses earlier in the day.

Clinton's aides also said in a hastily convened conference call that in some locations in Texas, Obama backers, who had taken over the meetings, had locked her supporters out of caucuses.

The campaign's legal counsel Lyn Utrecht warned that some precincts in Texas had also called in results even before they were supposed to open.

''There are numerous locations where Obama supporters have taken over the caucuses and have locked out Clinton supporters who should have been allowed to come in.''

She said all options were open for the campaign, including legal action, though no decisions had been taken.

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