The Democratic Senatorial Campaign Committee has made its first post-election ad buy in Louisiana, indicating that it expects the state’s Senate race will end in a runoff, according to the New York Times. Louisiana has a jungle primary system, meaning that if no candidate garners 50 percent of the vote on Election Day in November, the race will be decided in a runoff between the race’s top two candidates. No candidate is likely to hit 50 percent the first time around, so the DSCC has reportedly purchased more than $2 million in airtime designated for after the election to assist incumbent senator Mary Landrieu.

Representative Bill Cassidy is the Republican front-runner and appears poised to face Landrieu in a runoff. The National Republican Senatorial Committee has already set aside $3.4 million in airtime for after the election, and outside groups such as the Ending Spending political-action committee and Karl Rove’s Crossroads GPS will sink millions into the showdown too. A one-on-one race may favor the Republican candidate, as Cassidy leads Landrieu 52–43 in a head-to-head matchup, according to Rasmussen’s most recent poll of likely voters.