The leadership roles in the U.S. senate are very important and each one plays an important role. There is the President of the senate (Vice President) and ther is also the President Pro tempore which is the longest member of the senate. They can serve up to a 6 year term and the qualifications to become a senate is you have to be at least 30 years old and you have to be a U.S. citizen for 9 years.