Velocity Interactive Group, the venture-capital vehicle of former Fox Interactive CEO Ross Levinsohn and ex-AOL chief Jon Miller, has yet to raise a $250 million fund insiders say they've been seeking for six months and counting. Which is curious. Levinsohn and Miller tried to raise money on their own, but decided to merge with ComVentures, an established VC firm with $1.5 billion in assets under management. "Assets under management" isn't the same thing as "available cash," however. To have a free hand to invest, Miller and Levinsohn need their own pot of money. When will they get it?Now hardly seems like the time. The pension funds and college endowments which invest in VC funds have been pulling back, as of late. And investments in consumer Web startups — Miller and Levinsohn's specialty — are not looking as wise as they were a year ago. If the duo do raise money in this climate, it will be an impressive feat. If they don't? Then their second careers as venture capitalists may come to an abrupt end.