ANCHORAGE (Reuters) - Alaska Republican Lisa Murkowski Wednesday became the first U.S. senator in more than 50 years to win an election with a write-in campaign as she established an unassailable lead over conservative Tea Party movement favorite Joe Miller. The result of the last undecided Senate race of the November 2 congressional elections does not alter the makeup of the chamber, where Republicans picked up six seats but the Democrats retained their majority. Murkowski had a lead of about 10,000 votes with only 752 ballots left to be counted, a state election official said on Wednesday. According to the...