Colom's win will be the eighth Senate pickup for Democrats.By Oren Oppenheim Democrat Scott Colom will upset Republican incumbent Sen. Cindy Hyde-Smith in Mississippi, The Associated Press projected Wednesday, flipping a Republican seat in a ruby-red state. With 99% of the expected vote reported, Colom leads with 49.2%, and Hyde-Smith has 48.7% of the vote, with Colom leading by about 4,700 votes. Colom's win is the