The Republican presidential primary is getting crowded. With a former president and well-heeled politicians running, plus super PACs boosting them, it all points to what's likely going to be the most money ever spent to win the GOP nomination.
Early projections show it will likely cost close to or more than $1 billion, according to Open Secrets, which tracks campaign-finance spending. The final figure will depend on how long it takes for the nomination to be wrapped up.
