Democrat Sen. Mary Landrieu and Republican challenger Bill Cassidy will meet in a Dec. 6 runoff after neither captured enough votes to win Louisiana's primary election.
With all precincts reporting, Landrieu won 42 percent of the votes. Cassidy received 41 percent. Rob Maness received only 14 percent.
Attack ads peppered the campaign, backed by a flood of money from outside groups.
Cassidy hammered Landrieu on her support for the policies of President Barack Obama, while Landrieu used her 18 years of seniority and chairmanship of the Senate energy committee as a main selling point.
Sen. Mary Landrieu says the campaign starts brand new Wednesday morning. She took the opportunity Tuesday night to call out Bill Cassidy for hiding from voters. She said it's important that they know this is not a race about Barack Obama; it's a race about her record.
She has a challenge for Bill Cassidy.
"Six debates, six hours - one hour for each year of a senate term. I don't think that is too much to ask a guy that wants to represent 4.5 million people in the Unites States Senate," said Landrieu.
The Landrieu campaign has a new slogan. "Where was Bill?"
Congressman Bill Cassidy will focus his campaign on Landrieu's policies and her support for President Obama.
"If you want a senator who will vote again to repeal and replace Obamacare, who will work to get our economy going again by using America's natural resources, who will respect and protect your Second Amendment rights and also appreciate the culture of life -- If you want a senator that represents you, not Barack Obama, I look forward to getting your vote on December 6," said Cassidy.
Heading into the runoff, Cassidy and Landrieu look to attract the supporters of Rob Maness. He admitted defeat Tuesday night.
"We know it's time for fresh leadership in Washington, and for sure we know it's high time for Mary Landrieu to go," he said.
Cassidy states Maness called to congratulate him on Tuesday night.
The race was targeted in Republicans' push to regain control of the Senate. Cassidy gave up a U.S. House seat to run for Senate.