expectations of presidents: voters expect a president to "drive the economy, vanquish enemies, lead the free world, comfort tornado victims, heal the national soul and protect borrowers from hidden credit-card fees". Head of party The president is typically considered to be the head of their political party. Since the entire House of Representatives and at least one-third of the Senate is elected simultaneously with the president, candidates from a political party inevitably have their electoral success intertwined with the performance of the party's presidential candidate. The coattail effect, or lack thereof, will also often impact a party's candidates at state and local levels of government as well. However, there are often tensions between a president and others in the party, with presidents who lose significant support from their party's caucus in Congress generally viewed to be weaker and less effective. Global leader With the rise of the United States as a superpower in the 20th century, and the United States having the world's largest economy into the 21st century, the president is typically viewed as a global leader, and at times the world's most powerful political figure. The position of the United States as the leading member of NATO, and the country's strong relationships with other wealthy or democratic nations like those comprising the European Union, have led to the moniker that the president is the "leader of the free world." Selection process Eligibility Article II, Section 1, Clause 5 of the Constitution sets three qualifications for holding the presidency. To serve as president, one must: be a natural-born citizen of the United States; be at least 35 years old; be a resident in the United States for at least 14 years. A person who meets the above qualifications would, however, still be disqualified from holding the office of president under any of the following conditions: Under Article I, Section 3, Clause 7, having been impeached, convicted and disqualified from holding further public office, although there is some legal debate as to whether the disqualification clause also includes the presidential office: the only previous persons so punished were three federal judges. Under Section 3 of the Fourteenth Amendment, no person who swore an oath to support the Constitution, and later rebelled against the United States, is eligible to hold any office. However, this disqualification can be lifted by a two-thirds vote of each house of Congress. There is, again, some