Call it an invasion for Mars. Aerospace groups are planning a blitz next week to visit more than 200 members of Congress to push for funding for President Bush’s proposal to return man to the Moon, then go to Mars and beyond. Among the ringleaders is former astronaut and senator Jake Garn, R-Utah, although he personally will not be part of the visits because of speaking engagements in Utah. Garn is chairman of Global Space Travelers, one of 20 aerospace organizations that have decided to band together for what it calls the Moon-Mars Blitz from July 11-13, 2004.