No. A Dhampir is only reacts to channeling for the ourpose of healing/harming.
"Negative Energy Affinity: Though a living creature, a dhampir reacts to positive and negative energy as if it were undead—positive energy harms it, while negative energy heals it."
Besides, Dhampir aren't undead, merely living humanoids with some undead/vampire features.
Would make an intriguing twist on the race...