I had wondered about this with electoral votes, but as stated, it only takes a plurality and not a majority.
A law passed recently that will make Louisiana's Congressional Elections like other states, with a primary for each party and then a general election. By taking an extra month for the run-off, Louisiana's Congressmen missed out on things such as office selections and committee assignments.
Will it be like the current open primary system only a couple months earlier, or will it be a normal primary system?
It will be like a normal primary - each party's primary will take place several months before the election and the winner from each party will be on the ballot on election day in November.
Here is the article from BAN:
http://www.ballot-access.org/2006/06/27/louisiana-governor-signs-sb-18-closed-primaries-for-congress/It doesn't say a lot but does say that this year's congressional elections will still use the current top two system.
