(CNN) - After one day of counting ballots in Minnesota, the gubernatorial race is widening. Barely.
Republican Tom Emmer has lost four votes while Democrat Mark Dayton has gained 20. Dayton led Emmer by nearly 9,000 votes before the recount began.
The state's attempts to control frivolous vote challenges appear to be successful thus far-on Monday, Dayton's campaign challenged 86 votes, or one one-hundredth of one percent of those counted; Emmer's campaign challenged 281 votes, or three one-hundredths of a percent. Local election officials have been empowered to overrule challenges if they feel the action is not in good faith or warranted. A report detailing the number of overruled challenges will be released Thursday night.
Nearly 45 percent of the 2.1 million ballots cast have been re-counted, as 54 of the state's 87 counties completed their counting.
The secretary of state's press secretary said local election officials have made "terrific progress."