Both Barak Obama (leading Democrat candidate) and John McCain (leading Republican candidate) back the adoption of Instant Runoff Voting (ie, our system or preferential voting) in the US. They currently use first past the post for most elections, though many regional elections already use IRV. This is great news for democracy as it will give the system global publicity. Greater adoption of IRV will lead to greater political stability and greater accountability in established democracies.
http://www.fairvote.org/irv/
The two frontrunners for their party's nominations, Republican John McCain and Democrat Barack Obama, are both active backers of instant runoff voting (IRV). In 2002, Sen. McCain recorded a message for backers of IRV in Alaska, while that year Sen. Obama was the lead sponsor of legislation to implement IRV for certain Illinois elections. With most third party candidates also supporting IRV, we may see a rare issue of consensus this November, although neither McCain nor Obama have yet secured their party's nomination.
In the states, instant runoff voting appears next on the ballot in Santa Fe (NM), where it has the backing of the mayor, local newspapers and key community leaders. It also is advancing legislatively in states like Vermont.
Newly elected candidates are not the only winners from Election Day 2007. Voters in Sarasota (FL) and Aspen (CO) voted by more than three to one to move to instant runoff voting. 67% of voters in Pierce County (WA) voted to keep IRV on track for next year's county executive race, while voters in Clallam County narrowly rejected establishing an IRV option for now.
More and more places now use IRV. San Francisco held its fourth IRV election overall, with first-round winners in three citywide races, including mayor. Takoma Park (MD) smoothly held its first IRV election for mayor, with nary a single spoiled ballot, and the city of Hendersonville (NC) had a good first IRV election for two city council seats. Cambridge (MA)
held city council and school committee elections with the choice voting system of proportional voting, now in its seventh decade of use.
Cary (NC) on October 9th became the latest city to implement instant runoff voting (IRV) with great success. The city avoided an expensive runoff, and an exit poll showed three-to-one support for IRV over traditional runoffs and 96% understanding of the system. Three North Carolina dailies called for expanding IRV elections in their state. Meanwhile, IRV is on the ballot in several new cities and counties this fall, garnering newspaper support.
Article on adoption of IRV within the US:
http://www.ozpolitic.com/electoral-reform/adoption-instant-runoff-voting-US.html