LAS VEGAS – Democrats have a lock on Nevada’s congressional delegation, occupying three of four House seats and both Senate seats. But the Silver State’s lone Republican in Congress is in this year’s re-election catbird seat - unless an independent manages to play spoiler. An Emerson College poll of the state’s 2nd Congressional District – covering the mineral-rich northern swath from Tahoe and Reno near California to casino-packed West Wendover near the Utah border – has incumbent Rep. Mark Amodei ahead by 31 points. The Hill, which commissioned the poll, rates the Republican’s reelection prospects at greater than 99%. Game over, it would…