The money is flowing in Minnesota's U.S. Senate race.

On Thursday, in advance of Tuesday's federal campaign finance deadline, both Democratic U.S. Sen. Al Franken and his chief Republican rival Mike McFadden released their most recent fundraising numbers.

In the last three months, Franken, long a prodigious cash gatherer, raised 'over $3.3 million,' according to his campaign. McFadden, who has promised he will have to resources to compete, raised 'over $1.1 million,' his campaign said.

For the cycle, Franken has brought in $18.4 million. But most of it has been spent.Franken, who has been running an aggressive cycle of television advertisements, had $5 million cash on hand as of the start of this month.

Since starting to run last year, McFadden has raised $4 million. He had about half of it left at the start of July. McFadden, who won the Republican party's endorsement in May, only began a broadcast advertising campaign last week.

McFadden will face an August primary against several other Republicans, none of whom have raised significant cash, before he could vie against Franken in November.

So far, national outside groups have largely stayed out of the state's Senate race, with just a few exceptions. If the race tightens in the coming months, they may dump millions on Minnesota to influence the outcome.