By Dan Weil Momentum is gathering in Congress among Democrats and Republicans to limit stock trading by congressional members. Momentum is gathering in Congress among Democrats and Republicans to limit stock trading by members of the House and Senate. But not everyone from both parties is on board. Several bills have been introduced to limit trading, but there are plenty of issues where there’s conflict. That includes whether trading should be banned or securities put in a trust instead. There is disagreement as to whether spouses and other family members also should be banned from trading sto…