Former President Clinton will appear with Senator John Kerry at a lunchtime rally in Philadelphia Monday. Democrats hope the help from Clinton will be a boost to the presidential ticket in a crucial battleground state. The two-term former president also will campaign separately for the Democratic presidential nominee. That word comes from Joe Lockhart, an adviser to Kerry and former Clinton press secretary. Clinton, who is recovering from heart surgery, has agreed to the appearance for his fellow Democrat, who is locked in a tight race against President Bush. At a campaign rally Tuesday night, Kerry said he spoke to Clinton briefly by telephone before the event in Ohio. Kerry said Clinton encouraged him as the contest for the White House grows increasingly personal in its final days.