The rationale behind the 12th amendment and election

What was the rationale behind the 12th amendment and elections? 3. In 1824, there were four major candidates. Why can't more parties become powerful in the current US? 4. Alexis de Tocqueville wrote, "The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money." What did he mean by that? 5. He also wrote, “Men will not accept truth at the hands of their enemies, and truth is seldom offered to them by their friends.” How does this relate to the US now? 6. Frederick Douglass wrote,“This Fourth of July is yours, not mine, You may rejoice, I must mourn.” Do people have a valid reason to still mourn? >>