What if just 3 Senators switched from R to D?

Remember this? (even 2 switching wd help)

In the late afternoon of May 22, 2001 an apocalyptic-looking set of thunderstorms rolled across the National Mall, with bolts of lightning striking just outside the Capitol dome. Inside the Senate chamber, an even bigger storm was brewing -- James Jeffords, the venerable patrician Senator from Vermont, had informed Democratic and Republican party leaders that he was likely crossing the aisle.

Two days later Jeffords, who died Monday (Aug. 2014) at age 80, would leave the Republican Party that he served in on Capitol Hill for the previous 26 years, first in the House and then the Senate, and would caucus with Democrats. The move ended an historic five-month run in which the Senate sat deadlocked at 50-50 margin, with Vice President Dick Cheney giving Republicans titular control as the tie-breaking vote. Jeffords was handing Thomas A. Daschle (D-S.D.) the title of majority leader and putting the breaks on the domestic agenda of the Bush White House.

https://www.washingtonpost.com/news/the-fix/wp/2014/08/18/how-jim-jeffords-single-handedly-bent-the-arc-of-politics/?utm_term=.050cbd749ec0