Putin, who is barred by the constitution from seeking a third straight term in March presidential elections, has long indicated that he hopes to remain influential after stepping down.
He said last month that he might become prime minister, but there have been indications that he would instead choose an informal path.
Putin's remarks Tuesday seemed to seek to reinforce that idea — and send a message to those who have expressed doubt that he can manage to keep his grip on the country after leaving office.
The trip, Putin's first major one inside Russia since the campaign began, targeted a region where he won only 60 percent of the vote in the 2004 presidential election, compared with his more than 71 percent nationwide.
But across the city, United Russia billboards — reading ''Putin's Plan is Russia's Victory'' — far outnumber other parties' ads, and smaller United Russia signs are affixed to lamppost after lamppost along the main avenue downtown.
A local state-run television network late Monday showed Soviet-style preparations for Putin's visit, with a plow driver saying, ''We're working for Putin,'' as he pushed snow off the long road in from the airport.
Opposition parties say the authorities use their power to unfairly benefit United Russia, echoing foreign observers' statements after the 2003 parliamentary elections that state control over levers of influence gave the ruling party an advantage, undermining democracy.
The regional head of the liberal Union of Right Forces party, Vladislav Korolyov, said that illegal pressure from the authorities is preventing his party from getting its message to voters.
Opinion polls indicate United Russia will win a majority of votes in the upcoming elections and that only one other party, the Communists, is certain to clear the 7 percent barrier needed to win seats in the Duma.