'Our system of requires you get past the 50% mark in an election, or at least a plurality.'
except in state competitions in louisianna, right? cause they have the left over french system (not the british one that the rest of you inherited) So they simply have two rounds of voting and each party can field as many candidates as the like... then the two top pollers go for a second round....
So you can get two democrats or two republicans in a head to head contest for the seat...
In ireland we have a much better system, you essentially carry out all the possible votes at once, and then count multiple times. Each person vote for their first preference, and then lists who else they like in order.
The candidates with the least vote are eliminated (so in the first round if i only have 10 votes i'm eliminated, then if then next worst candidate has 20 votes, and the possible transfer of the 10 votes which went to me will only add up to 30 votes - which still can't get them elected they are also elimintated... then in the second round of counting, you transfer each vote to the highest preference still in the race. Simples. You often see two candidates from one party neck and neck in 3rd and 4th, and when one is eliminated the transfers push the other into first...)
Great for minor parties, also useful if there are multiple seats in a district, so you only need ~25% + 1 vote to win a seat in a three seat district...
And simple for the voters, you just decide your preference, you can vote for ron paul assuming he will be eliminated immediately and know you vote will go straight to your second preference.