After weeks of taking evidence, hearing arguments and deliberating privately, the Senate is prepared today to acquit President Clinton in a vote that is likely to deny the House prosecutors even a simple majority for conviction.

A third day of closed-door deliberations yesterday brought no surprises that would upset the widespread view that the Senate will fall far short of the two-thirds majority needed to convict Clinton and remove him from office for his actions in the Monica Lewinsky affair.

Sen. Olympia J. Snowe of Maine yesterday joined three other Republican senators who had earlier announced that they would vote to acquit Clinton of perjury as well as obstruction of justice.

Several senators said last night that a fifth Republican -- Sen. Susan M. Collins, also of Maine -- had told them that she, too, would reject both charges. Collins' office, however, did not release a statement saying how she will vote.

If Collins does vote to acquit on both charges, and if all 45 Democrats do so as well, the House Republican prosecutors would lack even the symbolic consolation of a simple majority vote of 51 in favor of either article of impeachment.

In her statement, Snowe explained that she found the president's behavior "deplorable and indefensible" and urged that Clinton be prosecuted by the criminal justice system after he leaves office.

But she said she could not vote to oust him.

"My struggle throughout this process was to reconcile the president's lowly conduct with the Constitution's high standards," Snowe said.

"I was determined that the only way I could approach this case was to ask myself, if I were the deciding vote, could I remove this president under these circumstances?

"The answer, I have concluded, is no."

In the closed chamber, as the 55 Republicans and 45 Democrats took turns announcing their positions in 15-minute speeches, there was no sign that any of the Democrats would vote to convict.

In fact, Sen. Russell D. Feingold of Wisconsin, the one Democrat who broke ranks with his party midway through the trial to vote against a motion to dismiss the charges, told his Senate colleagues yesterday that he would vote to acquit the president on both articles of impeachment.

Besides the handful of Republicans who intend to vote against both articles, at least two more Republicans have said they will vote to acquit Clinton on the perjury charge and to convict on obstruction of justice.

But one Republican senator who had been wavering on the perjury charge, Sen. Robert F. Bennett of Utah, came down yesterday firmly in favor of conviction on both charges.

Bennett said he has long been convinced that Clinton is a "bully" who "readily uses the power of his office for his personal ends regardless of who is hurt" and is thus guilty of obstruction of justice.

But Bennett said he had decided to vote to convict Clinton on the perjury charge only after considering press accounts of the president's career-long practice of "habitual mendacity."

"If this were a standard trial, as a juror I would not know any of that," Bennett acknowledged.

Even so, he said, he had concluded that "a president who has demonstrated a capacity to lie about anything great or small, whether or not under oath, does threaten our liberties."

Another moderate Republican, Sen. Gordon Smith of Oregon, also announced that after struggling with the question of whether to acquit Clinton, he had decided that he must vote for conviction on both articles.