WASHINGTON - A growing number of Republican voters are frustrated by congressional spending and scandal, according to GOP leaders from across the country who worry that an "enthusiasm deficit" could cost the party control of Congress in November. Some rank-and-file Republicans wonder what happened to the party that promised to reform Washington after taking control of Congress in 1994 for the first time in 40 years. "We've seen the enemy, and he is us," said Tom Rath, a Republican National Committee member from New Hampshire describing the sentiments of some GOP voters. "We have to get back to the basics....