PART 2 of 2 Parts commercials airing this weekend features U.S. Sen. John W. Warner, a Republican, urging state lawmakers to "stiffen their backs, stiffen the law and stiffen the penalties." The NRA, which has 90,000 Virginia members, won't disclose how much it is spending in its lobbying effort, although it will have to report its expenditures later in the year. It spent $136,710 in the last legislative election, in 1991, contributing to 49 of the 140 winning candidates and to 20 losers. The NRA gets personal with the governor. Its radio and newspaper ads question Wilder's commitment to controlling crime, saying that as a state senator he "voted against mandatory jail time for gun-toting criminals, even against the death penalty for mass murderers." Facing off with the NRA, Wilder has enlisted a team that includes the Republican federal prosecutor for eastern Virginia, Richard Cullen, and leading business executives, educators and health care professionals. More than 40 organizations, including the Greater Washington Board of Trade, the Virginia Parent-Teachers Association, the Arlington County Civic Federation and the Northern Virginia Planning District, have endorsed the measure. So too have the editorial pages of the state's largest newspapers. Each side has its own cartoon character. The NRA's Eddie Eagle instructs schoolchildren on gun safety. A Batman comic book, sent to each lawmaker by Wilder, deplores the easy access to guns in Virginia. Each side also has its own celebrities. A crowd of 1,200 people cheered Wayne R. LaPierre, the NRA's chief executive officer, at a rally on the Statehouse lawn two weeks ago. Sarah Brady, wife of former White House press secretary James Brady, who was shot in the assassination attempt on President Ronald Reagan a dozen years ago, came to town to debate an NRA board member. This weekend, she has been leaving phone messages urging lawmakers to vote for the bill. The lobbying has caused some lawmakers to reexamine long-held positions on gun control. Del. Vincent F. Callahan Jr. (R-McLean) has been one of the most reliable supporters of the gun lobby during his quarter-century in the House. The NRA, which grades legislators, gave him an A-plus in his last election campaign. But this week, Callahan is likely to get a failing grade from the NRA, because he has decided to support Wilder's bill. Suburban Republicans such as Callahan probably hold the key to the outcome. Urban Democrats in the General Assembly are solidly in favor of gun control, while most rural legislators, regardless of party, are opposed. Callahan said he doesn't believe that Wilder's bill, or the Republican alternative, will solve the problem of handgun violence. But, he said, "it's gotten to the place where you've got to respond" to the public outcry for action. "We can't come out of this session with nothing," said Callahan, whose seat in the 100-member House of Delegates, like those of all the other delegates, is up for election in November. Although not an NRA member, Callahan believes that "rank-and-file NRA members are reasonable people. I hear from a lot of NRA members who support one gun a month." Del. William C. Mims (R-Leesburg), one of a half-dozen Northern Virginia Republicans who accepted an average of $1,700 from the NRA in the 1991 election campaign - said he looked at himself in the mirror last year and decided there are "sound policy reasons" for limiting gun purchases. Mims said he retains "cordial relations" with the NRA, "but on this issue, we disagree."