In Denver's suburbs, McCain won Douglas County and Weld County, both by comfortable margins. However, Denver's suburbs swung heavily to the Democrats. Bush narrowly won Jefferson County, Arapahoe County, and Broomfield County (in addition to what McCain won) - all three flipped to the Democratic candidate in 2008. Thus, Obama was able to take landslide margins amongst the Democratic base while shifting suburban Colorado to the Democratic side. While he still lost places such as Colorado Springs, he greatly improved on Kerry's showing in those areas. Elsewhere in the state, Democrats also did well. Democratic Mark Udall defeated Republican Bob Schaffer for an open U.S. Senate seats; his vacated House seat was also won by Democrat Jared Polis. In addition, Democrat Betsy Markey defeated incumbent Republican Marilyn Musgrave, by 12 points for Colorado's 4th Congressional District seat. At the state level, Democrats picked up one seat in the Colorado Senate, but lost two seats in the Colorado House of Representatives. This is the first election since 1964, and the last election as of 2016, in which Grand County voted for the Democratic candidate. Obama's 65.8% victory in Summit County was the highest percentage win by a Democratic presidential nominee in the county since Woodrow Wilson won the county with 70.3% of the vote back in 1916. While Barack Obama won the state’s popular vote and 9 electoral votes, John McCain carried four of the state’s seven congressional districts, including both seats held by Republicans and two seats held by Democrats. Technically the voters of Colorado cast their ballots for electors: representatives to the Electoral College. Colorado is allocated 9 electors because it has 7 congressional districts and 2 senators. All candidates who appear on the ballot or qualify to receive write-in votes must submit a list of 9 electors, who pledge to vote for their candidate and his or her running mate. Whoever wins the majority of votes in the state is awarded all 9 electoral votes. Their chosen electors then vote for president and vice president. Although electors are pledged to their candidate and running mate, they are not obligated to vote for them. An elector who votes for someone other than his or her candidate is known as a faithless elector. The electors of each state and the District of Columbia met on December 15, 2008, to cast their votes for president and vice president. The Electoral College itself never meets as one body. Instead the electors from each state and the District of Columbia met in their respective capitols. The following were the members of the Electoral College from the state.