The U.S. Chamber of Commerce sent their national political director, Rob Engstrom, to Alabama last week to an endorsement event with Byrne, a former Democrat
who joined the Republicans in 1997.
Many of its members, such as Wal-Mart and Home Depot, have sent funds to Byrne's campaign, part of a total war chest of more than $689,000 according to the Federal Election Commission.
"Washington needs proven leaders who understand the principals of free enterprise," the chamber's spokesman Blair Latoff Holmes said.
His donor list reads like a who's who of national and local business leaders, with politicians such as House Majority Leader Eric Cantor, tossing in contributions.
In contrast, Young depends on grass-roots support with only a modest $85,546 raised, according to the FEC.