An opposition leader in Moscow called for a million-man march in Moscow two days before Vladimir Putin is to be sworn into office as president. Sergei Udaltsov, a left-leaning opponent of Prime Minister Putin, said demonstrations against Putin\'s political dominance would culminate in a mass May 5 protest. \"Let\'s come out to one of Moscow squares and not leave if we\'re numerous enough,\" he was quoted by Russia\'s state-run news agency RIA Novosti as saying. \"If the authorities have ignored a rally of a 100,000, we need to bring out more.\" Udaltsov was sentenced to 10 days in jail Thursday following his arrest during a weekend demonstration. Human Rights Watch had said that while the Kremlin was tolerant of dissent during the campaign season, activists were roughed up by authorities after the election. Putin secured a third non-consecutive term as president in an early March election. The Russian Central Election Commission certified Putin\'s 46-percentage-point victory over his closet rival, Communist leader Gennady Zyuganov. Opposition groups had said they wouldn\'t recognize Putin\'s victory. He\'s to be sworn in May 7.